Gear box, transmission chain and wind generating set

Abstract

The invention relates to a gear box, a transmission chain and a wind generating set, the gear box comprises a box body, a transmission wheel set and a first oil inlet structure, an oil supply hole is formed in the box body, the transmission wheel set is arranged in the box body, the transmission wheel set comprises a first-stage planetary gear train arranged in the axial direction and an N-stage gear train in transmission connection with the first-stage planetary gear train, N is larger than or equal to 1, and the first oil inlet structure is arranged in the first-stage planetary gear train. The first-stage planetary gear train comprises a first-stage planetary carrier and a first-stage planetary gear rotationally connected to the first-stage planetary carrier through a first-stage planetary gear bearing, the end, away from the N-stage gear train, of the first-stage planetary carrier is connected with the main shaft, and the freedom degree of the first-stage planetary carrier in the radial direction is limited through the main shaft; the first oil inlet pipeline extends from the output end of the transmission wheel set to the input end of the transmission wheel set in the axial direction, an inlet of the first oil inlet pipeline is communicated with the oil supply hole, and oil is supplied to the first-stage planet wheel bearing through an outlet of the first oil inlet pipeline, so that the first-stage planet wheel bearing of the front-end integrated transmission chain is lubricated.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and particularly to a gearbox, a transmission chain and a wind turbine generator set. Background Art

[0002] The gearbox is one of the important components of a wind turbine generator set. It is mainly used to transmit the power generated by the wind turbine under the action of wind to the generator and enable it to obtain the corresponding rotational speed, that is, through the speed-increasing effect of the gearbox, the rotational speed of the wind turbine reaches the rotational speed required for the generator to generate electricity. Among them, the lubrication effect of the gearbox plays a very important role in the operation of the entire gearbox. Once the lubrication is poor, it may cause gearbox failures and affect the service life of the gearbox.

[0003] For the front-end integrated transmission chain, due to the structural limitations of the gearbox, the input end of the internal transmission wheel set in the existing wind power speed-increasing gearbox is affected by the main shaft bending moment, which will cause the internal structure of the gearbox to deform, thus affecting the lubricating oil path transmission of the first-stage planetary gear bearing. Summary of the Invention

[0004] The present application provides a gearbox, a transmission chain and a wind turbine generator set, which can reduce the influence of the main shaft bending moment on the overall first oil inlet structure and improve the reliability of the lubricating oil path.

[0005] On the one hand, according to an embodiment of the present application, a gearbox is proposed for driving and cooperating with a main shaft, including: a box body provided with an oil supply hole; a transmission wheel set disposed in the box body, the transmission wheel set including a first-stage planetary gear train arranged along the axial direction and an N-stage gear train drivingly connected to the first-stage planetary gear train, N≥1, the first-stage planetary gear train including a first-stage planetary carrier and first-stage planetary gears rotatably connected to the first-stage planetary carrier through first-stage planetary gear bearings, the first-stage planetary carrier is connected to the main shaft, and the first-stage planetary carrier is supported on the main shaft at one end away from the N-stage gear train; a first oil inlet structure disposed in the transmission wheel set and including a first oil inlet pipeline extending axially from the output end of the transmission wheel set to the input end of the transmission wheel set, the inlet of the first oil inlet pipeline is communicated with the oil supply hole, and the first oil inlet pipeline supplies oil to the first-stage planetary gear bearing through the outlet of the first oil inlet pipeline.

[0006] According to one aspect of the embodiment of the present application, the first-stage planetary carrier includes a planetary carrier main body and planetary gear shafts disposed on the planetary carrier main body. The first oil inlet structure further includes a second oil inlet pipeline and a first bearing oil supply path. The second oil inlet pipeline is disposed in the planetary carrier main body, and the first bearing oil supply path is disposed in the planetary gear shaft and used for supplying oil to the first-stage planetary gear bearing. Among them, along the axial direction, the outlet of the first oil inlet pipeline extends and protrudes beyond the first-stage planetary gear, and the outlet of the first oil inlet pipeline is connected to the first bearing oil supply path through the second oil inlet pipeline.

[0007] According to one aspect of the embodiments of the present application, it further includes a wire threading pipe which is axially disposed through the drive pulley set and rotatably engaged with the box body. At least a part of the first oil inlet pipeline is integrated in the wire threading pipe, and oil is transported through the wire threading pipe.

[0008] According to one aspect of the embodiments of the present application, the wire threading pipe includes an inner pipe and an outer pipe arranged coaxially. A sealed cavity is formed between the inner pipe and the outer pipe, and the sealed cavity forms the first oil inlet pipeline. Connection ports are respectively arranged at both axial ends of the outer pipe, and the connection ports respectively form the inlet and outlet of the first oil inlet pipeline.

[0009] According to one aspect of the embodiments of the present application, an oil distribution ring is sleeved on the wire threading pipe corresponding to the connection port. The wire threading pipe is cooperated with the box body through the oil distribution ring. The oil distribution ring is provided with oil distribution holes extending radially, and the oil distribution holes are communicated with the connection ports.

[0010] According to one aspect of the embodiments of the present application, a sealing ring is arranged on the mating surface between the oil distribution ring and the wire threading pipe, and the sealing ring is axially arranged on both sides of the connection port respectively.

[0011] According to one aspect of the embodiments of the present application, the first oil inlet structure further includes a third oil inlet pipeline. Axially, the inlet of the first oil inlet pipeline extends and protrudes from the N-stage gear train. The third oil inlet pipeline is arranged on the box body, and the inlet of the first oil inlet pipeline is communicated with the oil supply hole through the third oil inlet pipeline.

[0012] According to one aspect of the embodiments of the present application, from the input end to the output end of the drive pulley set, the box body includes a plurality of sub-box bodies arranged axially in sequence. An internal gear ring is arranged between two adjacent sub-box bodies, and each internal gear ring is meshed with the corresponding gear train. The third oil inlet pipeline is arranged on the sub-box body of the box body that is axially farthest from the input end.

[0013] According to one aspect of the embodiments of the present application, the gearbox further includes a second oil inlet structure. The second oil inlet structure includes a fourth oil inlet pipeline and a second bearing oil supply pipeline. The fourth oil inlet pipeline is arranged on the box body. One end of the fourth oil inlet pipeline is connected to the oil supply hole, and the other end is connected to the second bearing oil supply pipeline arranged in the N-stage gear train and supplies oil to the internal bearings of the N-stage gear train.

[0014] According to one aspect of the embodiments of the present application, at least two sub-box bodies are provided with oil supply holes. The fourth oil inlet pipeline and the third oil inlet pipeline are respectively arranged on two sub-box bodies and are respectively communicated with the corresponding oil supply holes on each sub-box body.

[0015] According to one aspect of the embodiments of the present application, an oil circuit distribution part is arranged on the oil supply hole. The fourth oil inlet pipeline and the third oil inlet pipeline are arranged on the same sub-box body and are communicated with the oil supply hole through the oil circuit distribution part.

[0016] According to one aspect of an embodiment of the present application, when N≥2, in the N-stage gear train, the fourth oil inlet pipeline and the third oil inlet pipeline of the partial gear train on the side close to the first-stage planetary gear train are separately arranged on two sub-boxes, and are connected with the corresponding oil supply holes on the sub-boxes; the fourth oil inlet pipeline and the third oil inlet pipeline of the partial gear train on the side away from the first-stage planetary gear train are arranged on the same sub-box, and are connected with the oil supply hole through the oil circuit distribution component.

[0017] On the other hand, according to an embodiment of the present application, a transmission chain is proposed, including a gear box as in any of the above embodiments.

[0018] According to one aspect of an embodiment of the present application, the transmission chain also includes a main shaft and a bearing seat arranged on the input end side of the transmission wheel group, the main shaft is fixedly connected to the first-stage planetary carrier, and the bearing seat is fixedly connected to the box body.

[0019] On the other hand, according to an embodiment of the present application, a wind turbine generator set is provided, comprising a transmission chain as in any of the above embodiments.

[0020] The gearbox provided in the embodiment of the present application includes a housing, a transmission wheel set and a first oil inlet structure, and the transmission wheel set includes a primary planetary gear train and an N-stage gear train transmission-connected to the primary planetary gear train. For the primary planetary gear train, a first oil inlet structure is provided, and the first oil inlet structure extends from the output end of the transmission wheel set to the input end and supplies oil to the primary planetary gear bearing, that is, by changing the position of the first oil inlet structure, an oil path is formed from a radially offset position of a smaller size in the gearbox, thereby reducing the influence of the main shaft bending moment on the first oil inlet structure as a whole, and improving the reliability of the lubricating oil path. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0022] Figure 1 is a cross-sectional view of a gearbox according to an embodiment of the present application;

[0023] Figure 2 is an enlarged view of the third oil inlet pipeline of the gearbox of an embodiment of the present application;

[0024] Figure 3 is an enlarged view of a second oil inlet pipeline of a gearbox in one embodiment of the present application;

[0025] Figure 4 This is a schematic diagram of the structure of a first oil inlet pipeline of a gearbox according to an embodiment of the present application;

[0026] Figure 5 is a cross-sectional view of a gearbox according to another embodiment of the present application;

[0027] Figure 6It is an enlarged view of the second oil inlet structure of the gearbox according to an embodiment of the present application;

[0028] Figure 7 It is a cross-sectional view of the gearbox according to another embodiment of the present application.

[0029] In the drawings:

[0030] 100 - Gearbox;

[0031] 1 - Housing; 11 - Sub - housing; 2 - Transmission wheel set; 21 - First - stage planetary gear train; 211 - First - stage planet carrier; 2111 - Planet carrier main body; 2112 - Planet wheel shaft; 212 - First - stage planetary gear bearing; 213 - First - stage planetary gear; 22 - N - stage gear train; 221 - Second - stage planetary gear train; 222 - Third - stage planetary gear train; 3 - First oil inlet structure; 31 - First oil inlet pipeline; 32 - Second oil inlet pipeline; 33 - First bearing oil supply pipeline; 34 - Third oil inlet pipeline; 4 - Conduit; 41 - Inner pipe; 42 - Outer pipe; 43 - Oil distribution ring; 5 - Second oil inlet structure; 51 - Fourth oil inlet pipeline; 52 - Second bearing oil supply pipeline; K - Oil supply hole;

[0032] X - Axial direction.

[0033] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale. Detailed implementation manners

[0034] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a comprehensive understanding of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, at least some of the well - known structures and technologies are not shown in order to avoid unnecessarily obscuring the present application; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0035] The directional terms appearing in the following description are all the directions shown in the drawings, and do not limit the gearbox, transmission chain, and wind turbine generator set of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly defined and limited, the terms "mounted" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0036] A wind power gearbox, also known as a wind power transmission gearbox or a wind power speed increasing gearbox, is a very critical component in wind power generation equipment. The wind power gearbox mainly includes a multi-stage gear train, such as a multi-stage planetary gear train transmission, to make the rotational speed of the wind turbine reach the rotational speed required for the generator to generate electricity. For the gearbox, the parts that need lubrication mainly include the bearings of the multi-stage planetary gear train. Therefore, in the existing gearbox, an oil inlet pipeline needs to be formed inside the gearbox to introduce lubricating oil into the bearings of each stage of the planetary gear train.

[0037] In the existing gearbox, for the first-stage planetary gear train, it has supports at both ends of the first-stage planetary carrier. The oil inlet pipeline of the first-stage planetary gear bearing often enters from the rear end of the first-stage planetary carrier, that is, the end close to the second-stage planetary gear train, to achieve lubrication of the first-stage planetary gear bearing.

[0038] However, with the development of the gearbox towards high integration and high compactness, the front-end integrated drive chain has an increasingly high market occupancy rate. For the front-end integrated drive chain, the gearbox is integrally suspended on the main shaft system, and the first-stage planetary carrier is connected to the main shaft and uses the rear bearing of the main shaft as a support. Therefore, the first-stage planetary carrier of the front-end integrated drive chain only has a support at the front end. Affected by the bending moment of the main shaft, the radial offset of the first-stage planetary carrier at the rear end is relatively large. At this time, if the oil inlet pipeline of the first-stage planetary gear bearing still enters from the rear end of the first-stage planetary carrier, it is necessary to increase the clearance of the copper ring in the oil inlet structure, or an additional sealing ring, such as a sealing stack ring, is provided at the rear end of the first-stage planetary carrier to transfer the lubricating oil to the first-stage planetary gear bearing under the condition of a relatively large radial offset. However, the above structures are complex, and even if a sealing ring is provided, oil leakage may occur during the oil inlet process of the lubricating oil, affecting the lubricating oil path transmission of the first-stage planetary gear bearing.

[0039] To solve the above problems, the present application provides a new oil inlet structure to achieve reliable lubrication of the first-stage planetary gear train in the gearbox of the front-end integrated drive chain. The gearbox, drive chain and wind turbine generator set in the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0040] Please refer to Figure 1, an embodiment of the present application provides a gearbox 100 for driving cooperation with a main shaft, including a box body 1, a transmission wheel set 2, and a first oil inlet structure 3. The box body 1 is provided with an oil supply hole K. The transmission wheel set 2 is arranged in the box body 1. The transmission wheel set 2 includes a first-stage planetary gear train 21 arranged along the axial direction X and an N-stage gear train 22 drivingly connected to the first-stage planetary gear train 21, where N≥1. The first-stage planetary gear train 21 includes a first-stage planetary carrier 211 and first-stage planetary gears 213 rotatably connected to the first-stage planetary carrier 211 through first-stage planetary gear bearings 212. One end of the first-stage planetary carrier 211 away from the N-stage gear train 22 is connected to the main shaft, and the degree of freedom of the first-stage planetary carrier 211 along the radial direction is restricted by the main shaft. Among them, the first oil inlet structure 3 is arranged in the transmission wheel set 2. The first oil inlet structure 3 includes a first oil inlet pipeline 31 extending from the output end of the transmission wheel set 2 to the input end along the axial direction X. The inlet of the first oil inlet pipeline 31 is communicated with the oil supply hole K, and the first oil inlet pipeline 31 supplies oil to the first-stage planetary gear bearings 212 through the outlet of the first oil inlet pipeline 31.

[0041] The gearbox 100 in the embodiment of the present application includes a box body 1, a transmission wheel set 2, and a first oil inlet structure 3. The transmission wheel set 2 includes a first-stage planetary gear train 21 and an N-stage gear train 22 drivingly connected to the first-stage planetary gear train 21. For the first-stage planetary gear train 21, a first oil inlet structure 3 is provided. The first oil inlet structure 3 extends from the output end of the transmission wheel set 2 to the input end and supplies oil to the first-stage planetary gear bearings 212. That is, by changing the position of the first oil inlet structure 3, an oil path is formed at a position with a relatively small radial offset in the gearbox 100, so that the influence of the overall first oil inlet structure 3 on the main shaft bending moment can be reduced, and the reliability of the lubricating oil path can be improved.

[0042] It can be understood that compared with the first oil inlet pipeline 31 of the existing gearbox 100, the inlet of the first oil inlet pipeline 31 in the embodiment of the present application is arranged at the output end of the transmission wheel set 2. Since the output end of the transmission wheel set 2 is supported and fixed by the box body 1, the radial offset dimension of the inlet of the first oil inlet pipeline 31 is relatively small. And the outlet of the first oil inlet pipeline 31 is arranged at the input end of the transmission wheel set 2, that is, the front end of the first-stage planetary carrier 211. Since the front end of the first-stage planetary carrier 211 is cantilever supported by the main shaft, the radial offset dimension of the outlet of the first oil inlet pipeline 31 is also relatively small. Therefore, the influence of the overall first oil inlet structure 3 on the main shaft bending moment will be minimized, and the reliability of the lubricating oil path can be improved.

[0043] Moreover, since the first oil inlet structure 3 forms an oil path at a position with a relatively small radial offset in the gearbox 100, compared with the gearbox 100 in the prior art, a sealing ring does not need to be arranged at the rear end of the first-stage planetary carrier to achieve reliable transmission of lubricating oil, the structure is simpler and more reliable, and the cost is reduced.

[0044] Please refer toFigure 1 and Figure 2 In the first oil inlet structure 3, when the lubricating oil enters from the oil supply hole K of the box body 1, in some alternative embodiments, the first oil inlet structure 3 further includes a third oil inlet pipeline 34. Along the axial direction X, the inlet of the first oil inlet pipeline 31 extends and protrudes beyond the N-stage gear train 22. The third oil inlet pipeline 34 is arranged on the box body 1, and the inlet of the first oil inlet pipeline 31 is connected to the oil supply hole K through the third oil inlet pipeline 34.

[0045] After the lubricating oil enters from the oil supply hole K of the box body 1, it will enter the inlet of the first oil inlet pipe through the third oil supply pipeline arranged on the box body 1. By making the inlet of the first oil inlet pipeline 31 extend and protrude beyond the N-stage gear train 22, the whole of the third oil inlet pipeline 34 will bypass the end of the N-stage gear train 22 far from the first-stage planetary gear train 21, and thus enter the inlet of the first oil inlet pipe at the rear end of the box body 1, so as to simplify the first oil inlet structure 3 while reducing the influence of the main shaft bending moment on the third oil inlet pipeline 34, enabling the lubricating oil to reliably enter the inlet of the first oil inlet pipeline 31 through the third oil inlet pipeline 34.

[0046] Optionally, the third oil inlet pipeline 34 can be formed by opening a hole in the box body 1, so that there is no need to arrange pipes additionally inside, and the oil supply structure is simpler and more reliable.

[0047] In some alternative embodiments, from the input end to the output end of the transmission wheel set 2, the box body 1 includes a plurality of sub-box bodies 11 arranged in sequence along the axial direction X. An internal gear ring is arranged between two adjacent sub-box bodies 11, and each internal gear ring meshes with the corresponding gear train. The third oil inlet pipeline 34 is arranged on the sub-box body 11 of the box body 1 that is farthest from the input end in the axial direction X.

[0048] That is, the plurality of sub-box bodies 11 may include a front box body 1, at least one middle box body 1, and a rear box body 1. The front box body 1 is arranged at the input end of the transmission wheel set 2 and is arranged close to the main shaft side. The middle box body 1 installs at least the first-stage planetary gear train 21, and the rear box body 1 is arranged at the output end of the transmission wheel set 2. Therefore, by arranging the third oil inlet pipeline 34 on the sub-box body 11 of the box body 1 that is farthest from the input end in the axial direction X, that is, on the rear box body 1, the first oil inlet structure 3 can be made to inlet oil from the rear box body 1 to improve the reliability of oil inlet.

[0049] Optionally, in the axial direction X, the third oil inlet pipeline 34 can be arranged on the side of the rear box body 1 far from the front box body 1 to further reduce the influence of the main shaft bending moment on the third oil inlet pipeline 34 and improve the reliability of oil inlet.

[0050] Please refer to Figures 1 to 3, in the first oil inlet structure 3, after the lubricating oil flows out from the outlet of the first oil inlet pipeline 31, in some alternative embodiments, the first-stage planet carrier 211 includes a planet carrier main body 2111 and planet wheel shafts 2112 arranged on the planet carrier main body 2111. The first oil inlet structure further includes a second oil inlet pipeline 32 and a first bearing oil supply pipeline 33. The second oil inlet pipeline 32 is arranged inside the planet carrier main body 2111, and the first bearing oil supply pipeline 33 is arranged inside the planet wheel shaft 2112 and is used to supply oil to the first-stage planet wheel bearing 212. Wherein, along the axial direction X, the outlet of the first oil inlet pipeline 31 extends and protrudes beyond the first-stage planet wheel 213, and the outlet of the first oil inlet pipeline 31 is connected to the first bearing oil supply pipeline 33 via the second oil inlet pipeline 32.

[0051] After the lubricating oil is output from the outlet of the first oil inlet pipeline 31, it will directly enter the first-stage planet wheel bearing 212 through the second oil inlet pipeline 32 and the first bearing oil supply pipeline 33 arranged on the first-stage planet carrier 211, that is, a first oil inlet structure 3 composed of an oil supply hole K, a third oil inlet pipeline 34, the first oil inlet pipeline 31, the second oil inlet pipeline 32, and the first bearing oil supply pipeline 33 is formed. Wherein, since the outlet of the first oil inlet pipeline 31 extends and protrudes beyond the first-stage planet wheel 213, the second oil inlet pipeline 32 and the first bearing oil supply pipeline 33 as a whole will bypass the front end of the first-stage planetary gear train 21, that is, the side of the first-stage planet wheel 213 away from the N-stage gear train 22 and enter the first-stage planet wheel bearing 212, so as to simplify the first oil inlet structure 3 while reducing the influence of the main shaft bending moment on the second oil inlet pipeline 32 and the first bearing oil supply pipeline 33, enabling the lubricating oil to reliably enter the first-stage planet wheel bearing 212 through the second oil inlet pipeline 32 and the first bearing oil supply pipeline 33.

[0052] Optionally, both the second oil inlet pipeline 32 and the first bearing oil supply pipeline 33 can be formed by opening holes in the first-stage planet carrier 211, so that there is no need for additional pipe laying inside, and the oil supply structure is simpler and more reliable.

[0053] In addition, the second oil inlet pipeline 32 can be arranged on the main body of the first-stage planet carrier 211 and extend along the radial direction, and the first bearing oil supply pipeline 33 can be arranged on the planet wheel shaft of the first-stage planet carrier 211 and extend along the axial direction X for a preset length and then extend radially into the first-stage planet wheel bearing 212, so as to directly supply oil to the central position of the first-stage planet wheel bearing 212 along the axial direction X and improve the lubrication effect on the first-stage planet wheel bearing 212.

[0054] It can be understood that the first-stage planetary gear bearing 212 can be a rolling bearing or a sliding bearing. When the first-stage planetary gear bearing 212 is set as a rolling bearing, after the lubricating oil enters the first-stage planetary gear bearing 212 and lubricates it, it will flow to the housing 1 for oil discharge. When the first-stage planetary gear bearing 212 is set as a sliding bearing, the lubricating oil will form an oil film on the surface of the first-stage planetary gear bearing 212 and then discharge oil. That is, the oil discharge structure in the first-stage planetary gear bearing 212 can be adjusted according to the bearing type and the structure of the gearbox 100, as long as the oil discharge requirement can be met.

[0055] Since the first oil inlet pipeline 31 needs to extend along the axial direction X from the output end of the transmission wheel set 2 to the input end of the transmission wheel set 2, in some optional embodiments, the gearbox 100 further includes a wire threading pipe 4. The wire threading pipe 4 is axially penetrated through the transmission wheel set 2 and is rotationally matched with the housing 1. At least part of the first oil inlet pipeline 31 is integrated in the wire threading pipe 4, and the oil is transported through the wire threading pipe 4.

[0056] It can be understood that at least part of the first oil inlet pipeline 31 is integrated in the wire threading pipe 4. It can be that the first oil inlet pipeline 31 is set as an oil supply pipe, and the oil supply pipe is penetrated through the wire threading pipe 4 and is supported and fixed with the wire threading pipe 4 to realize the transportation of the lubricating oil through the oil supply pipe. It can also be that the wire threading pipe 4 supplies oil by itself, that is, no separate oil supply pipe is formed. The cable itself has heat insulation and insulation characteristics. The cable and the first oil inlet pipeline 31 are both arranged in the wire threading pipe 4, and the wire threading pipe 4 is used to realize the transportation of the lubricating oil. It can also be that the wire threading pipe 4 is set as a double-layer wire threading pipe 4, and the sandwich space of the double-layer wire threading pipe 4 is used as the first oil inlet pipeline 31 to realize the transportation of the lubricating oil.

[0057] Please refer to Figures 1 to 4 , when the wire threading pipe 4 is set as a double-layer wire threading pipe 4, specifically, the wire threading pipe 4 includes an inner pipe 41 and an outer pipe 42 arranged coaxially. A sealing cavity is formed between the inner pipe 41 and the outer pipe 42, and the sealing cavity is formed as the first oil inlet pipeline 31. Connection ports are respectively arranged at both ends of the outer pipe 42 along the axial direction X, and the connection ports respectively form the inlet and outlet of the first oil inlet pipeline 31.

[0058] Among them, the inner pipe 41 and the outer pipe 42 of the wire threading pipe 4 are integrally arranged and rotate synchronously with respect to the housing 1. The sealing cavity between the inner pipe 41 and the outer pipe 42 serves as the first oil inlet pipeline 31, and the lubricating oil can enter between the outer pipe 42 and the inner pipe 41 through the connection port at one end of the outer pipe 42 and be output to the first-stage planetary gear bearing 212 from the connection port at the other end of the outer pipe 42.

[0059] For ease of description, the connection port located at the output end of the planetary gear set is defined as the first connection port, and the connection port located at the input end of the planetary gear set is defined as the second connection port. That is, the first connection port forms the inlet of the first oil inlet pipeline 31, and the second connection port forms the outlet of the first oil inlet pipeline 31.

[0060] Optionally, the number of the first connection ports is more than two, and the more than two first connection ports are arranged at intervals along the circumferential direction of the wire threading pipe 4, so that during the process of the wire threading pipe 4 rotating synchronously with the box body 1, lubricating oil can uniformly enter the wire threading pipe 4 from the third oil inlet pipeline 34 through the more than two first connection ports, facilitating the lubricating oil to enter the sealing cavity of the wire threading pipe 4. Similarly, the number of the second connection ports is also more than two, and the more than two second connection ports are arranged at intervals along the circumferential direction of the wire threading pipe 4, so that during the process of the wire threading pipe 4 rotating synchronously with the box body 1, the lubricating oil is uniformly output from the more than two second connection ports to the second oil inlet pipeline 32, facilitating the lubricating oil to flow out of the sealing cavity and improving the reliability of the oil transmission of the first oil inlet pipeline 31.

[0061] In some optional embodiments, an oil distribution ring 43 is sleeved on the wire threading pipe 4 corresponding to the connection port. The wire threading pipe 4 is matched with the box body 1 through the oil distribution ring 43. The oil distribution ring 43 is provided with oil distribution holes extending radially, and the oil distribution holes are communicated with the connection ports.

[0062] Among them, the wire threading pipe 4 is provided with oil distribution rings 43 corresponding to the first connection port and the second connection port. The oil distribution rings 43 are sleeved on the outer periphery of the wire threading pipe 4. Taking the first connection port as an example, the outer diameter of the oil distribution ring 43 is matched with the box body 1, and the inner diameter of the oil distribution ring 43 is matched with the wire threading pipe 4, so that the lubricating oil in the third oil inlet pipeline 34 can enter the first connection port through the oil distribution holes on the oil distribution ring 43, realizing the transmission of the lubricating oil.

[0063] Optionally, the oil distribution ring 43 can be set as a copper ring, which is more wear-resistant.

[0064] Optionally, the oil distribution ring 43 can be provided with an annular groove along the circumferential direction. The annular groove is arranged on the inner wall surface of the oil distribution ring 43, so that the oil distribution holes can be matched with the first connection port through the annular groove. On the one hand, it is more convenient for assembly, without aligning the oil distribution holes with the first connection port, improving the assembly efficiency. On the other hand, it is also beneficial to the flow and diversion of the lubricating oil between the box body 1 and the wire threading pipe 4, making the flow of the lubricating oil smoother.

[0065] In some optional embodiments, a sealing ring is arranged on the matching surface of the oil distribution ring 43 and the wire threading pipe 4. The sealing ring is arranged on both sides of the connection port along the axial direction X respectively for sealing the oil, ensuring that the lubricating oil can be transported to the wire threading pipe 4 through the oil holes and improving the reliability of the lubricating oil transmission.

[0066] It can be understood that the first-stage planetary gear train 21 and the N-stage gear train 22 connected to the first-stage planetary gear train 21 can be a planetary gear train, a spur gear train or a differential gear train, or a combination of at least two of a planetary gear train, a spur gear train or a differential gear train, that is, the transmission wheel set 2 can be set to a variety of transmission structures, and the present application is not limited thereto. However, for the convenience of description, the following description is based on the example that the N-stage gear train 22 is a planetary gear train.

[0067] See also Figure 5 and Figure 6 In some optional embodiments, the gearbox 100 also includes a second oil inlet structure 5, the second oil inlet structure 5 includes a fourth oil inlet pipeline 51 and a second bearing oil supply pipeline 52, the fourth oil inlet pipeline 51 is arranged on the box body 1, one end of the fourth oil inlet pipeline 51 is connected to the oil supply hole K, and the other end is connected to the second bearing oil supply pipeline 52 arranged in the N-stage gear train 22 and supplies oil to the internal bearing of the N-stage gear train 22.

[0068] By respectively providing the first oil inlet structure 3 and the second oil inlet structure 5 for the first-stage planetary gear train 21 and the N-stage gear train 22, the lubricating oil circuits of the first-stage planetary gear train 21 and the N-stage gear train 22 can be separated, so that the lubricating oil quantity and the oil inlet pressure of the first-stage planetary gear train 21 and the N-stage gear train 22 can be individually controlled to meet the requirements of bearing lubrication.

[0069] In some embodiments, at least two sub-boxes 11 are provided with oil supply holes K, and the fourth oil inlet pipeline 51 and the third oil inlet pipeline 34 are respectively provided on the two sub-boxes 11 and are respectively connected to the corresponding oil supply holes K on each sub-box 11. By opening holes on at least two sub-boxes 11, the first oil inlet structure 3 and the second oil inlet structure 5 can be completely separated, and the two do not affect each other, so that the lubricating oil amount and the oil inlet pressure can be more effectively controlled for the first-stage planetary gear train 21 and the N-stage gear train 22, and the lubrication effect is better.

[0070] See also Figure 7 In other embodiments, the oil supply hole K is provided with an oil circuit distribution component, and the fourth oil inlet pipeline 51 and the third oil inlet pipeline 34 are arranged on the same sub-box 11 and are connected to the oil supply hole K through the oil circuit distribution component, so that the lubricating oil entering from the oil supply hole K is diverted through the oil circuit distribution component, and the oil is transported through the first oil inlet structure 3 and the second oil inlet structure 5 respectively, and the structure is simpler.

[0071] The position of the second oil inlet structure 5 can be adjusted according to the specific structures of the transmission wheel set 2 and the gear box 100 .

[0072] For example, when N = 1, that is, when the transmission gear set 2 of the gearbox 100 includes a first-stage planetary gear train 21 and a second-stage planetary gear train 221 that are drivingly connected, the first oil inlet structure 3 and the second oil inlet structure 5 can be respectively arranged on two sub-housings 11 to improve the lubrication effect.

[0073] When N ≥ 2, in the N-stage gear train 22, for the part of the gear train on the side close to the first-stage planetary gear train 21, the fourth oil inlet pipeline 51 and the third oil inlet pipeline 34 are respectively arranged on two sub-housings 11 and are communicated with the corresponding oil supply holes K on the sub-housings 11. For the part of the gear train on the side far from the first-stage planetary gear train 21, the fourth oil inlet pipeline 51 and the third oil inlet pipeline 34 are arranged on the same sub-housing 11 and are communicated with the oil supply hole K through an oil path distribution part.

[0074] That is, when the transmission gear set 2 of the gearbox 100 includes a planetary gear train with three or more stages, the second oil inlet structure 5 of the second-stage planetary gear train 221 and the first oil inlet structure 3 can be respectively arranged on two sub-housings 11, and the second oil inlet structure 5 and the first oil inlet structure 3 of the planetary gear train with three or more stages can be arranged on the same sub-housing 11, so as to simplify the structure while ensuring the reliability of the lubricating oil path.

[0075] In addition, the embodiment of the present application provides a transmission chain, which includes the gearbox 100 in any of the above embodiments, and further includes a main shaft and a bearing seat arranged on one side of the input end of the transmission gear set 2. The main shaft is fixedly connected to the first-stage planetary carrier 211, and the bearing seat is fixedly connected to the housing 1.

[0076] Specifically, the main shaft is rotatably installed in the bearing seat. The bearing seat is used to be installed on the machine base. The first-stage planetary carrier 211 of the transmission gear set 2 is fixedly connected to the main shaft, and the gearbox 100 is integrally suspended on the main shaft. Since the main shaft is directly fixedly connected to the first-stage planetary carrier 211, the stability of torque transmission is improved. The power is transmitted from the main shaft to the first-stage planetary carrier 211. The gearbox 100 and the main shaft share the bearings in the bearing seat, and the gearbox 100 and the main shaft system are integrated into one body, improving the transmission stability.

[0077] Moreover, since the first oil inlet structure 3 in the gearbox 100 extends from the output end to the input end of the transmission gear set 2, the first oil inlet structure 3 can, on the basis of the fixed connection between the main shaft and the first-stage planetary carrier 211, reduce the influence of the main shaft bending moment on the first oil inlet structure 3, so as to reliably transmit the lubricating oil to the first-stage planetary gear bearing 212 and ensure the lubrication effect of the first-stage planetary gear bearing 212.

[0078] The embodiment of the present application also provides a wind power generating set. Since it includes the transmission chain in any of the above embodiments, it has the characteristics of stable transmission, reliable lubrication, and simple structure, and is easy to be popularized and applied.

[0079] Although the present application has been described with reference to preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A gearbox (100) for driving cooperation with a main shaft, characterized in that, Comprising: A box body (1) provided with an oil supply hole (K); A transmission wheel set (2) disposed within the box body (1), the transmission wheel set (2) including a first-stage planetary gear train (21) arranged along the axial direction (X) and an N-stage gear train (22) drivingly connected to the first-stage planetary gear train (21), N≥1. The first-stage planetary gear train (21) includes a first-stage planetary carrier (211) and first-stage planetary gears (213) rotatably connected to the first-stage planetary carrier (211) via first-stage planetary gear bearings (212). One end of the first-stage planetary carrier (211) remote from the N-stage gear train (22) is connected to the main shaft, and the radial degree of freedom of the first-stage planetary carrier (211) is restricted by the main shaft; A first oil inlet structure (3) disposed within the transmission wheel set (2), and including a first oil inlet pipeline (31) extending along the axial direction (X) from the output end to the input end of the transmission wheel set (2). The inlet of the first oil inlet pipeline (31) is in communication with the oil supply hole (K), and the first oil inlet pipeline (31) supplies oil to the first-stage planetary gear bearings (212) through its outlet.

2. The gearbox (100) according to claim 1, characterized in that, The first-stage planetary carrier (211) includes a planetary carrier main body (2111) and planetary gear shafts (2112) disposed on the planetary carrier main body (2111). The first oil inlet structure (3) further includes a second oil inlet pipeline (32) and a first bearing oil supply path (33). The second oil inlet pipeline (32) is disposed within the planetary carrier main body (2111), and the first bearing oil supply path (33) is disposed within the planetary gear shaft (2112) and is used for supplying oil to the first-stage planetary gear bearings (212); Wherein, along the axial direction (X), the outlet of the first oil inlet pipeline (31) extends and protrudes beyond the first-stage planetary gear (213), and the outlet of the first oil inlet pipeline (31) is connected to the first bearing oil supply path (33) via the second oil inlet pipeline (32).

3. The gearbox (100) according to claim 1, characterized in that, Also included is a wire threading pipe (4) axially penetrating through the transmission wheel set (2) and rotatably mating with the box body (1). At least a part of the first oil inlet pipeline (31) is integrated within the wire threading pipe (4), and oil is transported through the wire threading pipe (4).

4. The gearbox (100) according to claim 3, characterized in that, The wire threading pipe (4) includes an inner pipe (41) and an outer pipe (42) coaxially arranged. A sealing cavity is formed between the inner pipe (41) and the outer pipe (42), and the sealing cavity forms the first oil inlet pipeline (31). Both ends of the outer pipe (42) along the axial direction (X) are respectively provided with connection ports, and the connection ports respectively form the inlet and outlet of the first oil inlet pipeline (31).

5. The gearbox (100) according to claim 4, characterized in that, A distributing oil ring (43) is sleeved on the wire threading pipe (4) corresponding to the connection ports. The wire threading pipe (4) cooperates with the box body (1) through the distributing oil ring (43). The distributing oil ring (43) is provided with distributing oil holes extending radially, and the distributing oil holes are in communication with the connection ports.

6. The gearbox (100) according to claim 5, characterized in that, A sealing ring is provided on the mating surface of the oil separating ring (43) and the pipe threading tube (4), and the sealing ring is respectively arranged on both sides of the connection port along the axial direction (X).

7. The gearbox (100) according to any one of claims 1 to 6, characterized in that, The first oil inlet structure (3) further includes a third oil inlet pipeline (34). Along the axial direction (X), the inlet of the first oil inlet pipeline (31) extends and protrudes beyond the N-stage gear train (22). The third oil inlet pipeline (34) is arranged on the box body (1), and the inlet of the first oil inlet pipeline (31) is connected to the oil supply hole (K) through the third oil inlet pipeline (34).

8. The gearbox (100) according to claim 7, characterized in that, From the input end to the output end of the transmission pulley set (2), the box body (1) includes a plurality of sub-box bodies (11) arranged in sequence along the axial direction (X). An internal gear ring is arranged between two adjacent sub-box bodies (11), and each internal gear ring meshes with the corresponding gear train. The third oil inlet pipeline (34) is arranged on the sub-box body (11) of the box body (1) that is farthest from the input end along the axial direction (X).

9. The gearbox (100) according to claim 8, characterized in that, The gear box (100) further includes a second oil inlet structure (5). The second oil inlet structure (5) includes a fourth oil inlet pipeline (51) and a second bearing oil supply pipeline (52). The fourth oil inlet pipeline (51) is arranged on the box body (1). One end of the fourth oil inlet pipeline (51) is connected to the oil supply hole (K), and the other end is connected to the second bearing oil supply pipeline (52) arranged in the N-stage gear train (22) and supplies oil to the internal bearings of the N-stage gear train (22).

10. The gearbox (100) according to claim 9, characterized in that, At least two of the sub-box bodies (11) are provided with the oil supply holes (K). The fourth oil inlet pipeline (51) and the third oil inlet pipeline (34) are respectively arranged on two of the sub-box bodies (11) and are respectively connected to the corresponding oil supply holes (K) on each sub-box body (11).

11. The gearbox (100) according to claim 9, characterized in that, An oil path distribution part is provided in the oil supply hole (K). The fourth oil inlet pipeline (51) and the third oil inlet pipeline (34) are arranged on the same sub-box body (11) and are connected to the oil supply hole (K) through the oil path distribution part.

12. The gearbox (100) according to claim 9, characterized in that, When N≥2, in the N-stage gear train (22), for the part of the gear train on the side close to the first-stage planetary gear train (21), the fourth oil inlet pipeline (51) and the third oil inlet pipeline (34) are respectively arranged on two of the sub-box bodies (11) and are connected to the corresponding oil supply holes (K) on the sub-box bodies (11). For the part of the gear train on the side far from the first-stage planetary gear train (21), the fourth oil inlet pipeline (51) and the third oil inlet pipeline (34) are arranged on the same sub-box body (11) and are connected to the oil supply hole (K) through an oil path distribution part.

13. A transmission chain, characterized in that, Comprising: The gear box (100) according to any one of claims 1 to 12; A main shaft system, including a main shaft and a bearing seat arranged at one end of the gear box (100). The main shaft is rotatably installed in the bearing seat. The main shaft is fixedly connected to the first-stage planetary carrier (211), and the bearing seat is fixedly connected to the box body (1).

14. A wind power generating set, characterized in that, Including the transmission chain according to claim 13.

Images